Augustin is Madame de Saint-Ange's servant and sometime lover. Unlike the Chevalier or Eugenie's father, however, Augustin is regarded by the other libertines less as a kindred soul then as a work-animal. Indeed, his main virtue for them is his thirteen-inch penis. Augustin services every other character in the book except the Chevalier. He is clearly dull and sent out of the room when the revolutionary pamphlet is read, lest he get ideas. At the end of the Fifth Dialogue, Dolamnce leads Augustin out of the room for a sexual act so shocking it is only whispered in Madame de Saint-Ange's ear.